122020476521 has 4 divisors (see below), whose sum is σ = 123691989972. Its totient is φ = 120348963072.

The previous prime is 122020476469. The next prime is 122020476551. The reversal of 122020476521 is 125674020221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125674020221 = 8387 ⋅14984383.

It can be written as a sum of positive squares in 2 ways, for example, as 78927283600 + 43093192921 = 280940^2 + 207589^2 .

It is a cyclic number.

It is not a de Polignac number, because 122020476521 - 2¹⁸ = 122020214377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122020476551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835756616 + ... + 835756761.

It is an arithmetic number, because the mean of its divisors is an integer number (30922997493).

Almost surely, 2^122020476521 is an apocalyptic number.

It is an amenable number.

122020476521 is a deficient number, since it is larger than the sum of its proper divisors (1671513451).

122020476521 is an equidigital number, since it uses as much as digits as its factorization.

122020476521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671513450.

The product of its (nonzero) digits is 13440, while the sum is 32.

Adding to 122020476521 its reverse (125674020221), we get a palindrome (247694496742).

The spelling of 122020476521 in words is "one hundred twenty-two billion, twenty million, four hundred seventy-six thousand, five hundred twenty-one".